If you get the below error, then your RDP target server needs to be patched.

You can choose to stay vulnerable and modify your policy or registry settings as explained in the first linked article below: that is a temporary “workaround” which I do not recommend. Please update your RDP target servers in stead.

English:

[Window Title]
Remote Desktop Connection
[Content]
An authentication error has occurred.
The function requested is not supported
Remote computer: rdp.example.org
This could be due to CredSSP-encryption Oracle remediation.
For more information, see https://go.microsoft.com/fwlink/?linkid=866660
[OK]